The "Tango Bar" is the fashion of the moment. The city's party-goers have chosen the small, cozy, intimate local venue for the night's wee hours. Gaby Grant is an ideal hostess who knows how to get guests to forget the day's sorrows and troubles - and knows how to get them to pay.

Young engineer Jameson quickly demonstrates his worth at his new workplace. Chief engineer Hooper is more interested in drinking whisky and chasing women than in making accurate calculations for the construction plans. Jameson quickly corrects this sloppiness, and his enthusiasm impresses both the foreman’s daughter Kitty and the manager, who promotes Jameson to chief engineer. Humiliated, Hooper ...